Celebrity masks of the likes of Simon Cowell, Princess Diana and Robbie Williams, are a familiar sight in tourist sites and seaside resorts. ‘Exhibit A’, a new show by Hugh Tisdale and Dan Murrell, converts this commonplace tourist trinket to witty, subversive and sometimes disturbing effect.

A rich seam of political caricature runs through British art; from Hogarth, James Gillray and Thomas Rowlandson to modern day equivalents of Peter Kennard, Martin Rowson and Steve Bell, the wealthy, privileged and powerful are interrogated, scrutinised and savaged.

‘Exhibit A’ stands in this tradition. The legacy of John Heartfield’s coruscating photomontages, that foretell and depict the savagery of the Third Reich, is also evident. There are also echoes of that notorious inquisitor of fame, Warhol, the presence of Mao and Monroe inevitably invite comparisons. Fame, benign or malign, is weighed and questioned. In an era where fame is no longer seen as a by-product of achievement, but a pre-eminent value in its own right, these questions are worth posing.

Masks have a long history in culture and art, enabling the concealment of individual identity and the assertion of others. Greek theatre masks enabled transformation into an array of roles, be it satyr or god, young or old, man or woman; Venetian masks were a subversive response to one of the most rigid class hierarchies in European history; African masks hugely influenced Picasso’s revolutionary ‘Les Demoiselles d’Avignon’; ‘V for Vendetta’ Guy Fawkes masks were a ubiquitous feature of the Occupy era. Today’s Facebook age has social media ‘masks’ that portray cheery pictures of full lives of contentment and achievement concealing mishaps, setbacks or flaws.

Fifty mask images, of mostly twentieth century figures, line the gallery walls. Appearances are deceptive – what initially appear to be photographs actually use a range of techniques including intricate drawing, crayon, watercolour as well as deft photo-shopping. Some are black and white, others in colour. The punched out eyes in the masks vary in size and character and produce a dead eyed, glassy glare, removing human warmth with blankness.

Despite this, some of the pictures retain a benign aspect, including Orwell - sans eyes, Big Brother isn’t watching you? – the Dalai Lama, Stalin, in ‘Uncle Joe’ mode rather than that of murderous despot, and an avuncular Nixon, a mask of whom was used in a bank heist scene in the film ‘Point Break’. Without eyes, Pele and Frank Zappa take on a decidedly belligerent air. Marie Curie appears to assume X-ray eyes. Very apt!Some themes are apparent, such as Artists as Art. Duchamp, one of these, would surely approve. Sometimes, the techniques used are associated with that artist, such as watercolour for Hockney. Damien Hirst, has ‘PRODUCT’ scrawled graffiti-style on his face and his lips appear sewn together, a critique of one whose artistic integrity is corrupted by Mammon. The cold, menacing image of Myra Hindley seems to allude to Marcus Harvey’s infamous portrait. Musicians are a prominent presence. The biro-blue of William Burrough’s picture reflects Burrough’s shambolic writing method. Many of the pictures are of iconoclasts who are now icons - Wilde, Malcolm X, Dylan, Picasso, Simone.

Some juxtapositions are particularly striking. A coarse, Super-8-textured image of JFK, with an extra bullet hole added, is near a black and white one of the last images of Lee Harvey Oswald, shortly to be assassinated himself. Nixon smiles near the terrified face of a Vietnamese child. A saccharine, almost kitsch, Christ stands close to Lennon, bringing to mind that latter’s then controversial remark that “We’re more popular than Jesus”. Some iconic fictional figures are present – the pared down Clockwork Orange is especially effective and memorable.

One of the most disturbing images is that of Jimmy Saville, whose ghoulish black and white face, redolent of an almost fairy tale evil, wears rose-tinted glasses to chilling effect. Another horrific image is that of 2nd Lieutenant Henry Lumley, whose grievous first world war wounds still shock and appal.

The exhibition is one of unsettling art for unsettling times. Trump, in all his orange, poisoned open-mouthed glory, is, with grim inevitability, one of the 50, and was selected before his shock victory. With its thoughtful blend of reflection, comment and protest the show merits a wide audience.

‘Exhibit A’ by Hugh Tisdale and Dan Murrell, is on at Rich Mix, Shoreditch, London, till Saturday 28th January 2017.